Consolidated Balance Sheet Parentheticals (Unaudited at March 31, 2012) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Balance Sheet Parentheticals (Unaudited at March 31, 2012)
Fixed maturities, available for sale, amortized cost	$ 60,777	$ 59,994
Equity securities, available for sale, cost	$ 419	$ 414
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	389.8	392.8
Common stock, shares outstanding	389.8	392.8	420.3	434.6
Treasury stock, at cost, shares	355.8	349.0